Cash is king, right? But check your pockets. Almost half of us walk around with less than $20. And with so many other ways to pay, including credit and debit cards, new technologies are pushing us to abandon paper money entirely. You could already be helping to make cash obsolete if you’re using one of the 37-million electronic toll tags on the road.

Maybe you’re using a mobile wallet like Apple Pay, Android Pay, PayPal or Samsung Pay or a person-to-person payment system via Square, Popmoney, Facebook Payments in Messenger, or Venmo to pay friends in a snap.

Branded apps from companies like Starbucks, Walmart, Uber and Dunkin’ Donuts make it simple for you to pay, while building customer loyalty for the merchants. But experts at Consumer Reports say there are potential down sides. Mobile payments can generate a mountain of digital data that can tell lots about us that we may not want people to know.

In the future, you may be getting rid of more than just your wallet. One day, you may not even need your phone. New, cashless technologies on the horizon will let you make payments with just a fingerprint. And, an app is in the works that will let you scan merchandise and pay for your purchases as you walk through the store- without ever going to a cash register.